<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="@/assets/favicon.png" alt="" />
      </div>
      <!-- 登录表单 -->
      <el-form ref="loginFormRef" :rules="loginFormRules" :model="loginForm" class="login_form">
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input prefix-icon="el-icon-key" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        username: [
          { required: true, message: '请输入您的账号', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10个字符', trigger: 'blur' }
        ], // 验证用户名
        password: [
          { required: true, message: '请输入您的密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 5 到 15个字符', trigger: 'blur' }
        ] // 验证密码
      }
    }
  },
  methods: {
    // 重置登录表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登录成功')
        console.log(res)
        window.sessionStorage.setItem('token', res.data.token)

        /** 1.将登陆成功之后的token 保存到客户端的sessionStorage中
         * 1.1 项目中除了登陆之外的API接口，必须登录之后才能访问
         * 1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
         * 2.通过编程式导航跳转到后天主页，地址路由是/home
         */
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background: linear-gradient(to right, #ff9569 0%, #e92758 100%);
  height: 100%;
  .login_box {
    width: 450px;
    height: 300px;
    border-radius: 3px;
    background-color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 5px;
      background-color: #eee;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      top: -25%;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
      }
    }
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
}
</style>
